Adds a way to determine id of content handler that created app

mojo/application/public/cpp/lib/application_impl.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/application/public/cpp/application_impl.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 42 matching lines @@
 scoped_ptr<ApplicationConnection>
     ApplicationImpl::ConnectToApplicationWithCapabilityFilter(
         URLRequestPtr request,
         CapabilityFilterPtr filter) {
   if (!shell_)
     return nullptr;
   ServiceProviderPtr local_services;
   InterfaceRequest<ServiceProvider> local_request = GetProxy(&local_services);
   ServiceProviderPtr remote_services;
   std::string application_url = request->url.To<std::string>();
-  shell_->ConnectToApplication(request.Pass(), GetProxy(&remote_services),
-                               local_services.Pass(), filter.Pass());
   // We allow all interfaces on outgoing connections since we are presumably in
   // a position to know who we're talking to.
   // TODO(beng): is this a valid assumption or do we need to figure some way to
   //             filter here too?
   std::set<std::string> allowed;
   allowed.insert("*");
-  scoped_ptr<ApplicationConnection> registry(new internal::ServiceRegistry(
+  InterfaceRequest<ServiceProvider> remote_services_proxy =
+      GetProxy(&remote_services);
+  scoped_ptr<internal::ServiceRegistry> registry(new internal::ServiceRegistry(
       application_url, application_url, remote_services.Pass(),
       local_request.Pass(), allowed));
+  shell_->ConnectToApplication(request.Pass(), remote_services_proxy.Pass(),
+                               local_services.Pass(), filter.Pass(),
+                               registry->GetConnectToApplicationCallback());
   if (!delegate_->ConfigureOutgoingConnection(registry.get()))
     return nullptr;
   return registry.Pass();
 }
 
 void ApplicationImpl::Initialize(ShellPtr shell, const mojo::String& url) {
   shell_ = shell.Pass();
   shell_.set_connection_error_handler([this]() { OnConnectionError(); });
   url_ = url;
   delegate_->Initialize(this);
@@ skipping 60 matching lines @@
 }
 
 void ApplicationImpl::UnbindConnections(
     InterfaceRequest<Application>* application_request,
     ShellPtr* shell) {
   *application_request = binding_.Unbind();
   shell->Bind(shell_.PassInterface());
 }
 
 }  // namespace mojo